Abstract
Microgram or nanogram quantities of heavy metals adsorbed on suspended solids are selectively floated to the solution surface by bubbling for 15 s. Prior to the flotation, negatively charged suspended solids are rendered hydrophobic and coagulated by stirring with a cationic surfactant and sodium chloride. Metal ions, humic acid complexes and colloidal hydrated metal oxides are not floated at all. After the separation of the suspended solids, the trace heavy metals are desorbed by ultrasound in 4 M nitric acid and determined by electrothermal atomic absorption spectrometry. This rapid and convenient flotation technique is successfully applied to the analysis of river, pond and waste waters.
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